01 - Preheat the oven to 400°F.
02 - In a large skillet over medium heat, add 1 tbsp olive oil. Add onion and bell peppers. Sauté for 8–10 minutes, stirring occasionally, until softened and lightly caramelized. Remove from skillet and set aside.
03 - In the same skillet, add another 1 tbsp olive oil. Add the sliced chicken, salt, pepper, garlic powder, and paprika. Cook for 6–8 minutes, stirring occasionally, until the chicken is cooked through and lightly browned.
04 - Return the sautéed vegetables to the skillet with the chicken. Stir to combine and heat through for 2 minutes.
05 - Slice the hoagie rolls lengthwise, leaving one edge intact. Lightly butter the insides of each roll. Place the rolls on a baking sheet, cut side up, and toast in the oven for 3–4 minutes until just golden.
06 - Divide the chicken and vegetable mixture evenly among the toasted rolls. Top each with 2 slices of provolone cheese.
07 - Return the sandwiches to the oven for 3–4 minutes, or until the cheese is melted and bubbly.
08 - Serve immediately while hot.